EP0674196A1 - Faseroptischer Steckverbinder - Google Patents

Faseroptischer Steckverbinder Download PDF

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Publication number
EP0674196A1
EP0674196A1 EP95103869A EP95103869A EP0674196A1 EP 0674196 A1 EP0674196 A1 EP 0674196A1 EP 95103869 A EP95103869 A EP 95103869A EP 95103869 A EP95103869 A EP 95103869A EP 0674196 A1 EP0674196 A1 EP 0674196A1
Authority
EP
European Patent Office
Prior art keywords
fibre
housing
optic connector
optical
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95103869A
Other languages
English (en)
French (fr)
Inventor
Gerd Schreiter
Steffen Reichel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whitaker LLC
Original Assignee
Whitaker LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB9405576A external-priority patent/GB9405576D0/en
Priority claimed from GBGB9500407.3A external-priority patent/GB9500407D0/en
Application filed by Whitaker LLC filed Critical Whitaker LLC
Publication of EP0674196A1 publication Critical patent/EP0674196A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3847—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3869—Mounting ferrules to connector body, i.e. plugs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/389—Dismountable connectors, i.e. comprising plugs characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type
    • G02B6/3893—Push-pull type, e.g. snap-in, push-on

Definitions

  • This invention relates to fibre optic connectors used to optically couple a first optical fibre to a second optical fibre by positioning the faces thereof in close proximity to each other.
  • the optical fibre ferrule In conventional fibre optic connectors it is common to incorporate a high precision fibre optic ferrule to locate the fibres relative to each other.
  • the optical fibre ferrule has a closely toleranced cylindrical outer surface, a closely toleranced, highly concentric bore and a transverse face.
  • the optical fibre is positioned within the concentric bore such that the face of the fibre can be polished to lie within the transverse surface.
  • locating the outer diameter will also allow the location of the optical fibre within the ferrule.
  • mating optical fibres have their faces lying in planes that are common with the plane of the face of the ferrule, alignment of the mating cylindrical ferrules should allow the faces of the optical fibre to be positioned within the same plane. Due to the high precision required by these fibre optic ferrules, and the sleeves used to align them, this construction is relatively expensive.
  • a connector of this type that is especially useful with plastic optical fibre is disclosed in International Patent Application Publication No. WO 92/14179.
  • This connector incorporates a pre-positioned optical fibre with a pre-polished face in a fibre optic ferrule. The fibre to be connected is then abutted to the end of the fibre and held in place with a clip that can bias the fibre against the pre-positioned stub.
  • this connector also incorporates the ferrule-type positioning as described above.
  • United States Patent 3,948,582 discloses an optical fibre connector comprising separately formed bodies, each of which have an axial bore in which an optical fibre is fitted. These bodies each have ends configured with respect to the configuration of the mating body, such as a flared socket and conical plug. As these ends connect, an optical fibre carried by one of the bodies is brought into abutment or close spacing with an optical fibre carried by the other one of the bodies.
  • an optical fibre extends from the face of a body having a conical plug of each of the connectors and are coupled within the bore of a sleeve having a flared socket. The locations of the end faces are such that when the plug of one of the connectors is seated within the socket, the end faces of the optical fibre are closely spaced apart or abutting.
  • connectors that interconnect fibres in an economical manner are desired. This involves not only the reduction in precision dimensions within the connector itself, but allowing for the minimal amount of time being used to form the connection.
  • the connector should be able to accommodate the dimensional changes of the fibre that result from the differing temperatures of the environment, as typically plastic fibre will be used.
  • This object is accomplished by having a first optical fibre disposed within a bore of a first plug with the face of the first optical fibre extending therefrom, while the second optical fibre is positioned within a bore of a second plug housing where the face of the second optical fibre is recessed within the bore.
  • the first fibre being received within the bore of the second plug so that the fibre faces are maintained in sufficiently close proximity to each other to ensure proper coupling.
  • one or the other or both fibres could be fixed within their respective bores or floatably mounted therein. It is also envisioned that one of the optical fibres could be replaced with an optical device, such as an emitter or receiver. This would be especially possible for the recessed end face.
  • the fibre optic connector 10 includes a first fibre 12 and a second fibre 14 terminated within first and second housings 16 and 18. These fibres may be plastic.
  • first housing 16 and second housing 18 are identical, thereby further enhancing the low cost aspect of the present invention by allowing the economies of scale inherent in manufacturing twice as many of the same component compared to two different configurations. While this is an advantageous aspect of the present invention, the first and second housings do not have to be similarly configured and there may be applications where it would be advantageous to have different configurations for each of the housings, such as when mating to an electro-optic device.
  • coupler sleeve 20 may also be of moulded plastic construction. Other means to couple the housings together may also be used including ones that are part of the housings themselves rather than distinct components as the illustrated coupler sleeve 20 represents.
  • the first optical fibre 12 and the second optical fibre 14 include a first end face 22 and a second end face 24 respectively.
  • Each of the optical fibres 12, 14 are surrounded by a protective jacket 26.
  • the protective jacket 26 is stripped therefrom.
  • Optical fibre 12 has a first stripped portion 28 that is longer than the second stripped portion 30 of the second optical fibre 14, thereby assuring that the first end face 22 of the first fibre 12 extends from the first housing 16 while the second end face 24 of the second fibre 14 is recessed within second housing 18.
  • a simple measuring device could be provided to assure the correct relationship is maintained. As will be described later, this relationship will not have to be maintained to a degree of high precision due to the float provided to one of the fibres.
  • Each of the housings 16, 18, respectively, include a front mating end 30, 32 and a fibre receiving end 34, 36 with a bore 38, 40 extending therebetween.
  • the front mating ends 30, 32 of each of the housings 16, 18 include transverse faces 42, 44.
  • the bores 38, 40 extend from these transverse faces 42, 44.
  • the second housing 18 includes an angular lead-in 46 between the face 44 and the bore 40. While this lead-in 46 is shown with linear surfaces, it would also be possible to incorporate other shapes, such as a conical lead-in.
  • the purpose of the lead-in 46 is to assure the first fibre 12 is received within the bore 40 where fibres 12, 14 are to be coupled.
  • Each of the bores 38, 40 include an aligning portion 48, 50 where the optical fibre 12, 14 is received.
  • each bore 38, 40 Extending further along each bore 38, 40 is a cavity 52, 54 that is enclosed by a rear cap 56, 58.
  • the rear cap 56, 58 is interconnected with the housings 16, 18 by way of an integrally moulded strap 60, 62.
  • the rear cap 56, 58 is press fit into the cavity 52, 54 where a barb 64, 66 on the cap 56, 58 is retained within a corresponding groove 68, 70 of the housings 16, 18.
  • a clip 72, 74 When the optical fibre 12, 14 is inserted into the corresponding housings 16, 18 the fibre is retained therein by a clip 72, 74.
  • These clips 72, 74 have two pairs of spaced apart legs 76.
  • the legs 76 are spaced apart both longitudinally and transversely by a web 78 so that the legs of each pair will span the optical fibre 12, 14.
  • a biasing member 82 in this case a coil spring, is positioned between the clip 72, 74 and the rear cap 56, 58 to force the optical fibre 12, 14 forward until the jacket 26 at the corresponding stripped portion 28, 30 abuts the shoulders 84, 86.
  • the housings 14, 16 further include retention tabs 88, 90 that are engageable with the coupler sleeve 20 to retain the housings 18, 20 in proper interconnection.
  • the coupler sleeve 20 is constructed to maintain proper positioning of the mating housings 16, 18 and the fibres therein 12, 14 to ensure transmissive coupling therebetween.
  • the sleeve 20 includes cavities 92, 94 for receiving the housing bodies and an alignment bore 96 extending therebetween.
  • the front mating end 30, 32 of each housings 16,18 is received within the alignment bore 96.
  • Openings 98 receive the retention tabs 88, 90 so that the respective housings 16, 18 are retained in their proper position.
  • keys 100 into the cavities 92, 94 to ensure proper orientation of the housings 16, 18 being inserted therein.
  • the connector 10 is ready for assembly. This assembly will be generally described with reference to the first optical fibre 12 and the first housing 16.
  • the first optical fibre 12 is inserted through the rear cap 56 where the biasing member 82 is placed thereupon. With the rear cap 56 closed and the first end face 22 of the fibre 12 extending the desired distance from the transverse face 42 of the first housing 16, there is no space between the protective jacket 26 and shoulder 84.
  • the clip 72 is then pressed through opening 80 onto the jacket 26 of the first optical fibre 12 to captivate the fibre 12 within the housing 16.
  • the fibre 12 has full float in the rearward direction so that the force exerted when the fibre abuts a mating surface, the other fibre 14 for example, does not result in damage to the optical face 22 and that any dimensional changes in the length of the fibre optic cable are accommodated while assuring the fibre 12 will be positioned to couple with the mating surface.
  • the second optical fibre 14 is assembled into it's housing 18 in a similar manner with the end face 24 recessed from the transverse face 44 of the second housing 18 an amount smaller than the distance the first face 22 extends from the first housing 16, thereby establishing that end-to-end abutment will occur.
  • a simple tool could be provided to assure this is accomplished with adequate accuracy as the longitudinal float will absorb minor inaccuracies.
  • the fibre optic connector 10 is ready for assembly.
  • the housings 16, 18 are inserted into the coupler sleeve 20 from opposite ends.
  • the front mating ends 30, 32 are received within the alignment bore 96 and the first fibre 12 enters the lead-in portion 46 of the bore 40 of the second housing 18.
  • Cavities 92, 94 and the alignment bore 96 of the coupler sleeve 20 are sized to receive the respective housings 16, 18 and generally position them within the coupler sleeve 20.
  • the lead-in portion 46 on the second housing 18 is sized to accommodate any misalignment between the first fibre 12 and the bore 40 of the second housing 18 so that the first fibre 12 will be received within the aligning portion 50 of the bore 40 in a close sliding fit, thereby assuring the alignment of the optical fibres 12, 14.
  • it is the configuration and precision of this bore 40 that establishes proper alignment of the fibres 12, 14 without the need to locate the housings 16, 18 to the precision associated with other fibre optic connectors.
  • the housings 16, 18 are inserted into the coupler sleeve 20 until the retention tabs 88, 90 are received in openings 98 thereby retaining the housings within the sleeve.
  • the transverse faces 42, 44 of the housings 16, 18 do not necessarily have to come into contact with each other.
  • the biasing members 82 urge the fibre faces 22, 24 into abutment or close proximity thereto and furthermore, when the fibres abut, act to control the amount of force exerted on the faces 22, 24.
  • Keys 100 can be incorporated into the coupler sleeve 20 to ensure proper orientation of the housings 16, 18 therein.
  • the configuration of the components described herein is generally cylindrical, other configurations may be desirable, including ones that incorporate keying into the selected shape of the housing or coupler sleeve themselves both to assure correct orientation during assembly and to prevent rotation thereafter.
  • an index matching material 102 can be inserted therein so that polishing of the end faces 22, 24 is unnecessary.
  • the fibre optic connector of the present invention minimizes the quantity at precision features required in a fibre optic connector to effectively couple mating optical fibres by receiving both fibres 12, 14 within a common bore 40 so that they are radially aligned and resiliently biased so that proper end face 22, 24 alignment is assured.
  • the primary precision feature required is the bore 40 where the fibres 12, 14 are received.
  • the housings 16, 18 containing the fibres 12, 14 are only used to generally position the fibres 12, 14, as opposed to prior art connectors that position the fibre faces by accurately positioning some features of the housings relative to each other, thereby requiring additional features that must be of high precision dimensionally, concentrically and perpendicularly to the bores containing the fibres.
  • an optical fibre connector according to the present invention is shown generally at 200.
  • the fibre optic interconnection comprises a first and a second connector half 202 and 204 respectively.
  • each of the connector halves 202,204 include an identical outer shell 206 which houses inner housings 208 and 210 respectively.
  • Mating optical fibres 212 and 214 are terminated within their respective housings 208,210.
  • the optical fibres 212,214 are retained within their respective housings 208,210 by a U-shaped clip 212 to assure that the optical fibres are maintained within their respective housings.
  • a resilient member in this case a coil spring 216, acts between the outer housing 206 and the inner housings 208,210.
  • Each outer shell 206 includes a fibre receiving end 218 which has a fibre entry 220 wherein the optical fibre passes through.
  • a basically cylindrical seat 222 wherein the coil spring 216 is positioned.
  • the seat 222 opens into a four-sided housing cavity 224 which receives the respective inner housing 208,210 therein.
  • the inner housing 208,210 includes respective body portions 226,228 which have a cross-section that is complementary to that of the housing receiving cavity 224. In this embodiment, this cross-section is basically rectangular. However, other cross-sections may be used.
  • One advantage of non-circular cross-sections is that the inner housing is prevented from non-translational movement relative to the shell 206.
  • the inner housings 208,210 slide in their respective cavities 224 in a translational manner and are biased forward by the coil spring 216.
  • latches 230 are provided that interfere with the respective inner housing 208,210 in a manner that prevents the inner housing from being expelled from the outer shell 206 by the coil spring 216.
  • the body portions 226 and 228 of the first and second inner housings 208,210 each include a rear face 232 upon which the coil spring 216 acts.
  • the optical fibres 212,214 extend through the coil spring 216 and into their respective housings 208,210 by way of a fibre passage 234 formed therein.
  • a transverse opening 236 is formed in the housing body and is in communication with the fibre cavity 234. The transverse opening 236 accepts the clip 212 that engages the fibre. The clip 212 then retains the fibre with the respective housing. Forward of the transverse opening 236 there is a reduced diameter alignment portion 238, 238' wherein the optical fibre itself 240,242 is disposed.
  • the alignment portion 238 in inner housing 208 is a simple cylindrical barrel, while the alignment portion 238' of the inner housing 210 includes three guide ribs 239 forming a tri-lobed structure that is complementary to the optical fibre 242 where concave surfaces on each of the ribs cooperate to define the alignment portion 238' that corresponds to the outer surface of the fibre along three separated surfaces.
  • a shroud 244 extends outward from the body 226.
  • the shroud has an outer configuration 246 that is an extension of the body 226.
  • the shroud 244 defines an inner cavity 248 with a peripheral wall 250 thereabout.
  • the shroud 246 extends forwardly to a face 252.
  • the inner cavity 248 includes a base wall 256 from which a free end 254 of the optical fibre 240 extends into the cavity 248.
  • the second inner housing 210 includes a similarly configured body portion 228 that has a nose portion 258 extending therefrom.
  • the alignment section 238 of the fibre cavity extends through the nose to an open mating face 260. Inward of the mating face 260, the end face 262 of the optical fibre 242 is positioned within the alignment portion 248.
  • the cross-section of the nose 258 is basically complementary to the internal cavity 248 of the shroud of the first inner housing 208 and sized for a sliding fit therewith.
  • the outer shell 206 includes a body portion 264 having a generally rectangular cross-section with an interior cavity formed as described above.
  • the body portion 264 includes the fibre receiving end 218 and a fibre coupling end 266 opposite therefrom.
  • Extending along opposing peripheral walls of the body 264 are a pair of guide arms 268.
  • Located on one of the other walls of the body 264 is a latch arm 270 basically of U-shaped configuration defining an inner shoulder 272.
  • the latch arm 270 is a locking lug 274.
  • a complementary connector region 276 is thereby defined.
  • the mating connector halves 202 and 204 are shown in their interconnected position.
  • the locking arms 270 of each of the outer shells 206 engage corresponding lugs 275 of the opposing shell and are retained therewith by interference with the abutment surface 274.
  • the mating faces 266 of each of the shells 206 are brought into close proximity of each other.
  • the shroud 244 of the first inner housing 208 is received within the housing cavity 224 of the outer shell 206 of the second connector half 204.
  • the nose portion 258 of the second inner housing 210 is received within the cavity 248 defined by the shroud 244.
  • a portion of the optical fibre 240 that extends into the cavity 248 is received within the alignment portion 248 where its front face 254 abuts the front face 262 of the optical fibre 214 contained within the second connector half 204.
  • the nose 258 of the second housing 210 does not abut the base 256 of the first inner housing 208 and the forward portion 252 of the shroud of the first inner housing 208 does not abut the body portion 228 of the second inner housing 210.
  • the only abutment is occurring between the optical faces 254,262 and this abutment is maintained by way of the resilient forces exerted by the coil springs 216. In this embodiment, it was chosen to fix the fibres relative to the inner housings and then bias the entire inner housing forward.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
EP95103869A 1994-03-22 1995-03-16 Faseroptischer Steckverbinder Withdrawn EP0674196A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9405576 1994-03-22
GB9405576A GB9405576D0 (en) 1994-03-22 1994-03-22 Fibre optic connector
GBGB9500407.3A GB9500407D0 (en) 1995-01-10 1995-01-10 Fibre optic connector
GB9500407 1995-01-10

Publications (1)

Publication Number Publication Date
EP0674196A1 true EP0674196A1 (de) 1995-09-27

Family

ID=26304550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103869A Withdrawn EP0674196A1 (de) 1994-03-22 1995-03-16 Faseroptischer Steckverbinder

Country Status (3)

Country Link
EP (1) EP0674196A1 (de)
JP (1) JPH07270646A (de)
KR (1) KR950033538A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0928978A1 (de) * 1997-12-22 1999-07-14 Lucent Technologies Inc. Verbinder für optische Fasern aus Kunststoff
WO2001061397A1 (fr) * 2000-02-16 2001-08-23 Monobe Engineering Co., Ltd. Connecteur optique et methode de connexion
EP1640755A3 (de) * 2004-09-16 2006-04-12 Smiths Group plc Optische Steckeranordnungen
US7942589B2 (en) 2003-12-24 2011-05-17 3M Innovative Properties Company Optical connector, optical fiber with connector, optical fiber connecting device, and optical fiber connection method
US20210302663A1 (en) * 2015-11-13 2021-09-30 CommScope Connectivity Belgium BVBA Fiber optic connection system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4821209B2 (ja) * 2005-04-14 2011-11-24 住友電気工業株式会社 光コネクタ及び光コネクタの組立方法
US7534051B2 (en) 2006-04-12 2009-05-19 Sumitomo Electric Industries, Ltd. Optical fiber connector, optical fiber connecting method, and connector converter
ITBS20110042U1 (it) * 2011-07-15 2013-01-16 Camozzi S P A Societa Unipersonal E Connettore per fibre ottiche
JP6647733B2 (ja) * 2015-07-24 2020-02-14 矢崎総業株式会社 光コネクタ、及び、光コネクタの接続方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948582A (en) * 1973-11-16 1976-04-06 Bicc Limited Optical fibre connector
FR2464490A1 (fr) * 1979-08-31 1981-03-06 Deutsch Co Dispositif de connexion pour fibres optiques
EP0034987A1 (de) * 1980-02-22 1981-09-02 COMPAGNIE Deutsch (Société Anonyme) Verbindungsvorrichtung für optische Fasern
GB2084345A (en) * 1980-09-12 1982-04-07 Bendix Corp Pin and socket terminals for fiber optic cables
EP0298144A1 (de) * 1987-07-07 1989-01-11 Japan National Oil Corporation Eintauchbarer optischer Steckverbinder
EP0462907A1 (de) * 1990-06-21 1991-12-27 RADIALL Société anonyme dite: Faseroptischer Stecker mit schneller Verriegelung und Entriegelung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948582A (en) * 1973-11-16 1976-04-06 Bicc Limited Optical fibre connector
FR2464490A1 (fr) * 1979-08-31 1981-03-06 Deutsch Co Dispositif de connexion pour fibres optiques
EP0034987A1 (de) * 1980-02-22 1981-09-02 COMPAGNIE Deutsch (Société Anonyme) Verbindungsvorrichtung für optische Fasern
GB2084345A (en) * 1980-09-12 1982-04-07 Bendix Corp Pin and socket terminals for fiber optic cables
EP0298144A1 (de) * 1987-07-07 1989-01-11 Japan National Oil Corporation Eintauchbarer optischer Steckverbinder
EP0462907A1 (de) * 1990-06-21 1991-12-27 RADIALL Société anonyme dite: Faseroptischer Stecker mit schneller Verriegelung und Entriegelung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0928978A1 (de) * 1997-12-22 1999-07-14 Lucent Technologies Inc. Verbinder für optische Fasern aus Kunststoff
WO2001061397A1 (fr) * 2000-02-16 2001-08-23 Monobe Engineering Co., Ltd. Connecteur optique et methode de connexion
US7942589B2 (en) 2003-12-24 2011-05-17 3M Innovative Properties Company Optical connector, optical fiber with connector, optical fiber connecting device, and optical fiber connection method
EP1640755A3 (de) * 2004-09-16 2006-04-12 Smiths Group plc Optische Steckeranordnungen
US7189006B2 (en) 2004-09-16 2007-03-13 Smiths Group Plc Optical connector assemblies
US20210302663A1 (en) * 2015-11-13 2021-09-30 CommScope Connectivity Belgium BVBA Fiber optic connection system

Also Published As

Publication number Publication date
JPH07270646A (ja) 1995-10-20
KR950033538A (ko) 1995-12-26

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